PLATE XXVII. 



Figs. 1-10. Pentacrinus alternicirrus, n. sp. 



Fig. 1. Portion of stem containing two nodal joints; interradial 

 view, ....... 



Fig. 2. Lower or syzygial face of n nodal joint which bears three 

 cirri, ...... 



Fig. 3. The corresponding face of a joint bearing only two cirri, 

 Fig. 4. The ambulacral skeleton of a pinnule ; from above, 

 Fig. 5. The end of a pinnule ; from the side, . 

 Fig. 6. The arm-groove and brachial ambulacrum. 



Fig. 12. The same ; from above, 



Fig. 13. The l)rachial ambulacrum ; from above, 



Diam. 

 3 



6 



6 

 15 

 12 

 12 



Figs. 7, 8. Inner and outer sides of an arm, bearing a pinnule-cyst of 



Myzostovia deformator, von Graff, . . . x 3 



Figs. 9, 10. Inner and outer sides of an arm, modified by a cyst of 



Myzostoma jjentacrini, von Grafi'. . . . x 3 



Figs. 11-13. Pentacrinus naresianus, n. sp. 



Fig. 11. The ambulacral skeleton of a pinnule; from the side. Some 



of the covering plates have been removed, . . x 1 5 



Page 

 270 



323 



323 

 323 



80 



80 



324 

 324 



X 12 

 X 12 



78 

 78 



